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Title: Observation of the Decay Λ b 0 Λ c + τ ν ¯ τ

Abstract

The first observation of the semileptonic b -baryon decay Λ b 0 Λ c + τ - ν ¯ τ , with a significance of 6.1σ , is reported using a data sample corresponding to 3 fb - 1 of integrated luminosity, collected by the LHCb experiment at center-of-mass energies of 7 and 8 TeV at the LHC. The τ- lepton is reconstructed in the hadronic decay to three charged pions. The ratio K = B ( Λ b 0 Λ c + τ - ν ¯ τ ) / B ( Λ b 0 Λ c + π - π + π - ) is measured to be 2.46±0.27±0.40 , where the first uncertainty is statistical and the second systematic. The branching fraction B( Λ b 0 Λ c + τ- ν ¯ τ )= ( 1.50 ± 0.16 ± 0.25 ± 0.23 ) % is obtained, where the third uncertainty is from the external branching fraction of the normalization channel Λ b 0 Λ c + π - π + π - . The ratio of semileptonic branching fractions R ( Λ c + ) B ( Λ b 0 Λ c + τ - ν ¯ τ ) / B ( Λ b 0 Λ c + μ - ν ¯ μ ) is derived to be 0.242±0.026±0.040±0.059 , where the external branching fraction uncertainty from the channel Λ b 0 Λ c + μ - ν ¯ μ contributes to the last term. This result is in agreement with the standard model prediction.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ORCiD logo; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; « less
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE
Contributing Org.:
LHCb Collaboration
OSTI Identifier:
1867750
Alternate Identifier(s):
OSTI ID: 1982825
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Name: Physical Review Letters Journal Volume: 128 Journal Issue: 19; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Physics; leptonic, semileptonic & radiative decays; bottom baryons; hadron colliders; flavor symmetries

Citation Formats

Aaij, R., Abdelmotteleb, A. S. W., Beteta, C. Abellán, Abudinén, F., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Agapopoulou, C., Aidala, C. A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Albero, A. Alfonso, Aliouche, Z., Alkhazov, G., Cartelle, P. Alvarez, Amato, S., Amey, J. L., Amhis, Y., An, L., Anderlini, L., Andersson, M., Andreianov, A., Andreotti, M., Archilli, F., Artamonov, A., Artuso, M., Arzymatov, K., Aslanides, E., Atzeni, M., Audurier, B., Bachmann, S., Bachmayer, M., Back, J. J., Rodriguez, P. Baladron, Balagura, V., Baldini, W., Baptista de Souza Leite, J., Barbetti, M., Barlow, R. J., Barsuk, S., Barter, W., Bartolini, M., Baryshnikov, F., Basels, J. M., Bashir, S., Bassi, G., Batsukh, B., Battig, A., Bay, A., Beck, A., Becker, M., Bedeschi, F., Bediaga, I., Beiter, A., Belavin, V., Belin, S., Bellee, V., Belous, K., Belov, I., Belyaev, I., Bencivenni, G., Ben-Haim, E., Berezhnoy, A., Bernet, R., Berninghoff, D., Bernstein, H. C., Bertella, C., Bertolin, A., Betancourt, C., Betti, F., Bezshyiko, Ia., Bhasin, S., Bhom, J., Bian, L., Bieker, M. S., Biesuz, N. V., Bifani, S., Billoir, P., Biolchini, A., Birch, M., Bishop, F. C. R., Bitadze, A., Bizzeti, A., Bjørn, M., Blago, M. P., Blake, T., Blanc, F., Blusk, S., Bobulska, D., Boelhauve, J. A., Garcia, O. Boente, Boettcher, T., Boldyrev, A., Bondar, A., Bondar, N., Borghi, S., Borisyak, M., Borsato, M., Borsuk, J. T., Bouchiba, S. A., Bowcock, T. J. V., Boyer, A., Bozzi, C., Bradley, M. J., Braun, S., Rodriguez, A. Brea, Brodzicka, J., Gonzalo, A. Brossa, Brundu, D., Buonaura, A., Buonincontri, L., Burke, A. T., Burr, C., Bursche, A., Butkevich, A., Butter, J. S., Buytaert, J., Byczynski, W., Cadeddu, S., Cai, H., Calabrese, R., Calefice, L., Cali, S., Calladine, R., Calvi, M., Gomez, M. Calvo, Magalhaes, P. Camargo, Campana, P., Quezada, A. F. Campoverde, Capelli, S., Capriotti, L., Carbone, A., Carboni, G., Cardinale, R., Cardini, A., Carli, I., Carniti, P., Carus, L., Akiba, K. Carvalho, Vidal, A. Casais, Caspary, R., Casse, G., Cattaneo, M., Cavallero, G., Celani, S., Cerasoli, J., Cervenkov, D., Chadwick, A. J., Chapman, M. G., Charles, M., Charpentier, Ph., Barajas, C. A. Chavez, Chefdeville, M., Chen, C., Chen, S., Chernov, A., Chobanova, V., Cholak, S., Chrzaszcz, M., Chubykin, A., Chulikov, V., Ciambrone, P., Cicala, M. F., Vidal, X. Cid, Ciezarek, G., Clarke, P. E. L., Clemencic, M., Cliff, H. V., Closier, J., Cobbledick, J. L., Coco, V., Coelho, J. A. B., Cogan, J., Cogneras, E., Cojocariu, L., Collins, P., Colombo, T., Congedo, L., Contu, A., Cooke, N., Coombs, G., Corredoira, I., Corti, G., Sobral, C. M. Costa, Couturier, B., Craik, D. C., Crkovská, J., Torres, M. Cruz, Currie, R., Da Silva, C. L., Dadabaev, S., Dai, L., Dall’Occo, E., Dalseno, J., D’Ambrosio, C., Danilina, A., d’Argent, P., Dashkina, A., Davies, J. E., Davis, A., Francisco, O. De Aguiar, De Bruyn, K., De Capua, S., De Cian, M., Da Graca, U. De Freitas Carneiro, De Lucia, E., De Miranda, J. M., De Paula, L., De Serio, M., De Simone, D., De Simone, P., De Vellis, F., de Vries, J. A., Dean, C. T., Debernardis, F., Decamp, D., Dedu, V., Del Buono, L., Delaney, B., Dembinski, H. -P., Denysenko, V., Derkach, D., Deschamps, O., Dettori, F., Dey, B., Di Cicco, A., Di Nezza, P., Didenko, S., Maronas, L. Dieste, Dijkstra, H., Dobishuk, V., Dong, C., Donohoe, A. M., Dordei, F., dos Reis, A. C., Douglas, L., Dovbnya, A., Downes, A. G., Dudek, M. W., Dufour, L., Duk, V., Durante, P., Durham, J. 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Garcia, Garrido, L., Gaspar, C., Geertsema, R. E., Gerick, D., Gerken, L. L., Gersabeck, E., Gersabeck, M., Gershon, T., Gerstel, D., Giambastiani, L., Gibson, V., Giemza, H. K., Gilman, A. L., Giovannetti, M., Gioventù, A., Gironell, P. Gironella, Giugliano, C., Gizdov, K., Gkougkousis, E. L., Gligorov, V. V., Göbel, C., Golobardes, E., Golubkov, D., Golutvin, A., Gomes, A., Fernandez, S. Gomez, Abrantes, F. Goncalves, Goncerz, M., Gong, G., Gorbounov, P., Gorelov, I. V., Gotti, C., Grabowski, J. P., Grammatico, T., Cardoso, L. A. Granado, Graugés, E., Graverini, E., Graziani, G., Grecu, A., Greeven, L. M., Grieser, N. A., Grillo, L., Gromov, S., Cazon, B. R. Gruberg, Gu, C., Guarise, M., Guittiere, M., Günther, P. A., Gushchin, E., Guth, A., Guz, Y., Gys, T., Hadavizadeh, T., Haefeli, G., Haen, C., Haimberger, J., Haines, S. C., Halewood-leagas, T., Hamilton, P. M., Hammerich, J. P., Han, Q., Han, X., Hansen, E. 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Aaij, R., Abdelmotteleb, A. S. W., Beteta, C. Abellán, Abudinén, F., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Agapopoulou, C., Aidala, C. A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Albero, A. Alfonso, Aliouche, Z., Alkhazov, G., Cartelle, P. Alvarez, Amato, S., Amey, J. L., Amhis, Y., An, L., Anderlini, L., Andersson, M., Andreianov, A., Andreotti, M., Archilli, F., Artamonov, A., Artuso, M., Arzymatov, K., Aslanides, E., Atzeni, M., Audurier, B., Bachmann, S., Bachmayer, M., Back, J. J., Rodriguez, P. Baladron, Balagura, V., Baldini, W., Baptista de Souza Leite, J., Barbetti, M., Barlow, R. J., Barsuk, S., Barter, W., Bartolini, M., Baryshnikov, F., Basels, J. 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@article{osti_1867750,
title = {Observation of the Decay Λ b 0 → Λ c + τ − ν ¯ τ},
author = {Aaij, R. and Abdelmotteleb, A. S. W. and Beteta, C. Abellán and Abudinén, F. and Ackernley, T. and Adeva, B. and Adinolfi, M. and Afsharnia, H. and Agapopoulou, C. and Aidala, C. A. and Aiola, S. and Ajaltouni, Z. and Akar, S. and Albrecht, J. and Alessio, F. and Alexander, M. and Albero, A. Alfonso and Aliouche, Z. and Alkhazov, G. and Cartelle, P. Alvarez and Amato, S. and Amey, J. L. and Amhis, Y. and An, L. and Anderlini, L. and Andersson, M. and Andreianov, A. and Andreotti, M. and Archilli, F. and Artamonov, A. and Artuso, M. and Arzymatov, K. and Aslanides, E. and Atzeni, M. and Audurier, B. and Bachmann, S. and Bachmayer, M. and Back, J. J. and Rodriguez, P. Baladron and Balagura, V. and Baldini, W. and Baptista de Souza Leite, J. and Barbetti, M. and Barlow, R. J. and Barsuk, S. and Barter, W. and Bartolini, M. and Baryshnikov, F. and Basels, J. M. and Bashir, S. and Bassi, G. and Batsukh, B. and Battig, A. and Bay, A. and Beck, A. and Becker, M. and Bedeschi, F. and Bediaga, I. and Beiter, A. and Belavin, V. and Belin, S. and Bellee, V. and Belous, K. and Belov, I. and Belyaev, I. and Bencivenni, G. and Ben-Haim, E. and Berezhnoy, A. and Bernet, R. and Berninghoff, D. and Bernstein, H. C. and Bertella, C. and Bertolin, A. and Betancourt, C. and Betti, F. and Bezshyiko, Ia. and Bhasin, S. and Bhom, J. and Bian, L. and Bieker, M. S. and Biesuz, N. V. and Bifani, S. and Billoir, P. and Biolchini, A. and Birch, M. and Bishop, F. C. R. and Bitadze, A. and Bizzeti, A. and Bjørn, M. and Blago, M. P. and Blake, T. and Blanc, F. and Blusk, S. and Bobulska, D. and Boelhauve, J. A. and Garcia, O. Boente and Boettcher, T. and Boldyrev, A. and Bondar, A. and Bondar, N. and Borghi, S. and Borisyak, M. and Borsato, M. and Borsuk, J. T. and Bouchiba, S. A. and Bowcock, T. J. V. and Boyer, A. and Bozzi, C. and Bradley, M. J. and Braun, S. and Rodriguez, A. Brea and Brodzicka, J. and Gonzalo, A. Brossa and Brundu, D. and Buonaura, A. and Buonincontri, L. and Burke, A. T. and Burr, C. and Bursche, A. and Butkevich, A. and Butter, J. S. and Buytaert, J. and Byczynski, W. and Cadeddu, S. and Cai, H. and Calabrese, R. and Calefice, L. and Cali, S. and Calladine, R. and Calvi, M. and Gomez, M. Calvo and Magalhaes, P. Camargo and Campana, P. and Quezada, A. F. Campoverde and Capelli, S. and Capriotti, L. and Carbone, A. and Carboni, G. and Cardinale, R. and Cardini, A. and Carli, I. and Carniti, P. and Carus, L. and Akiba, K. Carvalho and Vidal, A. Casais and Caspary, R. and Casse, G. and Cattaneo, M. and Cavallero, G. and Celani, S. and Cerasoli, J. and Cervenkov, D. and Chadwick, A. J. and Chapman, M. G. and Charles, M. and Charpentier, Ph. and Barajas, C. A. Chavez and Chefdeville, M. and Chen, C. and Chen, S. and Chernov, A. and Chobanova, V. and Cholak, S. and Chrzaszcz, M. and Chubykin, A. and Chulikov, V. and Ciambrone, P. and Cicala, M. F. and Vidal, X. Cid and Ciezarek, G. and Clarke, P. E. L. and Clemencic, M. and Cliff, H. V. and Closier, J. and Cobbledick, J. L. and Coco, V. and Coelho, J. A. B. and Cogan, J. and Cogneras, E. and Cojocariu, L. and Collins, P. and Colombo, T. and Congedo, L. and Contu, A. and Cooke, N. and Coombs, G. and Corredoira, I. and Corti, G. and Sobral, C. M. Costa and Couturier, B. and Craik, D. C. and Crkovská, J. and Torres, M. Cruz and Currie, R. and Da Silva, C. L. and Dadabaev, S. and Dai, L. and Dall’Occo, E. and Dalseno, J. and D’Ambrosio, C. and Danilina, A. and d’Argent, P. and Dashkina, A. and Davies, J. E. and Davis, A. and Francisco, O. De Aguiar and De Bruyn, K. and De Capua, S. and De Cian, M. and Da Graca, U. De Freitas Carneiro and De Lucia, E. and De Miranda, J. 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E. and Yin, H. and Yu, J. and Yuan, X. and Yushchenko, O. and Zaffaroni, E. and Zavertyaev, M. and Zdybal, M. and Zenaiev, O. and Zeng, M. and Zhang, D. and Zhang, L. and Zhang, S. and Zhang, S. and Zhang, Y. and Zhang, Y. and Zharkova, A. and Zhelezov, A. and Zheng, Y. and Zhou, T. and Zhou, X. and Zhou, Y. and Zhovkovska, V. and Zhu, X. and Zhu, X. and Zhu, Z. and Zhukov, V. and Zou, Q. and Zucchelli, S. and Zuliani, D. and Zunica, G. and LHCb Collaboration},
abstractNote = {The first observation of the semileptonic b-baryon decay Λb0→Λc+τ-ν¯τ, with a significance of 6.1σ, is reported using a data sample corresponding to 3 fb-1 of integrated luminosity, collected by the LHCb experiment at center-of-mass energies of 7 and 8 TeV at the LHC. The τ- lepton is reconstructed in the hadronic decay to three charged pions. The ratio K=B(Λb0→Λc+τ-ν¯τ)/B(Λb0→Λc+π-π+π-) is measured to be 2.46±0.27±0.40, where the first uncertainty is statistical and the second systematic. The branching fraction B(Λb0→Λc+τ-ν¯τ)=(1.50±0.16±0.25±0.23)% is obtained, where the third uncertainty is from the external branching fraction of the normalization channel Λb0→Λc+π-π+π-. The ratio of semileptonic branching fractions R(Λc+)≡B(Λb0→Λc+τ-ν¯τ)/B(Λb0→Λc+μ-ν¯μ) is derived to be 0.242±0.026±0.040±0.059, where the external branching fraction uncertainty from the channel Λb0→Λc+μ-ν¯μ contributes to the last term. This result is in agreement with the standard model prediction.},
doi = {10.1103/PhysRevLett.128.191803},
journal = {Physical Review Letters},
number = 19,
volume = 128,
place = {United States},
year = {Fri May 13 00:00:00 EDT 2022},
month = {Fri May 13 00:00:00 EDT 2022}
}

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